$SWX
Southwest Gas Holdings, Inc. Stock $swx

$swx Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000169211522000005 Filed on March 01, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$1.084B	$3.348B	$914.1M
YoY Change	18.64%	1.5%	7.78%
Cost Of Revenue	$134.7M	$1.746B	$78.20M
YoY Change	72.23%	0.94%	-15.28%
Gross Profit	$949.7M	$1.603B	$835.9M
YoY Change	13.62%	2.12%	10.6%
Gross Profit Margin	87.58%	47.86%	91.45%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$103.4M	$371.0M	$87.00M
YoY Change	18.82%	11.76%	8.89%
% of Gross Profit	10.88%	23.15%	10.41%
Operating Expenses	$836.2M	$2.880B	$683.1M
YoY Change	22.42%	13.69%	10.61%
Operating Profit	$113.5M	$448.1M	$152.8M
YoY Change	-25.7%	5.93%	10.56%
Interest Expense	-$32.97M	$107.1M	-$19.30M
YoY Change	70.84%	-3.96%	-18.57%
% of Operating Profit	-29.04%	23.89%	-12.63%
Other Income/Expense, Net	-$4.548M	-$92.63M	-$4.800M
YoY Change	-5.25%	-21.67%	200.0%
Pretax Income	$76.01M	$355.5M	$128.7M
YoY Change	-40.94%	16.64%	13.99%
Income Tax	$4.830M	$70.63M	$23.70M
% Of Pretax Income	6.35%	19.87%	18.41%
Net Earnings	$69.94M	$277.1M	$103.5M
YoY Change	-32.45%	19.26%	12.89%
Net Earnings / Revenue	6.45%	8.27%	11.33%
Basic Earnings Per Share		$4.90	$1.82
Diluted Earnings Per Share	$1.150M	$4.89	$1.82
COMMON SHARES
Basic Shares Outstanding	60.39M shares	56.56M shares	56.46M shares
Diluted Shares Outstanding		56.65M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$222.7M	$222.7M	$83.40M
YoY Change	167.02%	-5.68%	68.48%
Cash & Equivalents	$222.7M	$222.7M	$83.35M
Short-Term Investments
Other Short-Term Assets	$583.2M	$583.2M	$172.3M
YoY Change	238.5%	2890.91%	-23.56%
Inventory
Prepaid Expenses
Receivables	$707.1M	$792.0M	$522.2M
Other Receivables	$16.82M	$16.82M	$10.90M
Total Short-Term Assets	$1.615B	$1.615B	$871.0M
YoY Change	85.39%	85.39%	1.3%
LONG-TERM ASSETS
Property, Plant & Equipment	$8.761B	$8.334B	$6.729B
YoY Change	30.19%	23.85%	6.19%
Goodwill	$1.781B		$345.2M
YoY Change	416.05%		0.63%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$458.5M	$608.6M	$508.9M
YoY Change	-9.89%	-6.4%	2.4%
Total Long-Term Assets	$11.15B	$11.15B	$7.865B
YoY Change	41.78%	41.78%	7.59%
TOTAL ASSETS
Total Short-Term Assets	$1.615B	$1.615B	$871.0M
Total Long-Term Assets	$11.15B	$11.15B	$7.865B
Total Assets	$12.77B	$12.77B	$8.736B
YoY Change	46.12%	46.12%	6.93%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$353.4M	$353.4M	$231.3M
YoY Change	52.77%	52.77%	-3.19%
Accrued Expenses	$84.44M	$97.23M	$69.20M
YoY Change	22.02%	21.69%	-12.52%
Deferred Revenue	$59.33M		$67.92M
YoY Change	-12.65%		-1.8%
Short-Term Debt	$1.909B	$1.909B	$107.0M
YoY Change	1684.11%	1684.11%	-49.29%
Long-Term Debt Due	$297.3M	$306.2M	$40.43M
YoY Change	635.35%	654.14%	-75.27%
Total Short-Term Liabilities	$3.112B	$3.112B	$912.0M
YoY Change	241.25%	241.23%	-15.55%
LONG-TERM LIABILITIES
Long-Term Debt	$4.116B	$4.136B	$2.732B
YoY Change	50.64%	51.36%	18.77%
Other Long-Term Liabilities	$2.387B	$1.598B	$2.251B
YoY Change	6.04%	-0.35%	2.35%
Total Long-Term Liabilities	$6.503B	$5.734B	$4.983B
YoY Change	30.49%	32.24%	10.74%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.112B	$3.112B	$912.0M
Total Long-Term Liabilities	$6.503B	$5.734B	$4.983B
Total Liabilities	$9.615B	$9.811B	$5.895B
YoY Change	63.09%	61.88%	5.66%
SHAREHOLDERS EQUITY
Retained Earnings	$1.114B		$1.068B
YoY Change	4.34%		2.78%
Common Stock	$1.886B		$1.668B
YoY Change	13.09%		9.48%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.954B	$2.954B	$2.675B
YoY Change
Total Liabilities & Shareholders Equity	$12.77B	$12.77B	$8.736B
YoY Change	46.12%	46.12%	6.93%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$69.94M	$277.1M	$103.5M
YoY Change	-32.45%	19.26%	12.89%
Depreciation, Depletion And Amortization	$103.4M	$371.0M	$87.00M
YoY Change	18.82%	11.76%	8.89%
Cash From Operating Activities	$59.86M	$302.1M	$138.3M
YoY Change	-56.72%	-51.75%	13.45%
INVESTING ACTIVITIES
Capital Expenditures	-$208.9M	$767.2M	-$192.6M
YoY Change	8.46%	-7.02%	-11.93%
Acquisitions		$0.00
YoY Change
Other Investing Activities	-$1.512B	-$8.136M	$9.000M
YoY Change	-16903.67%	-9.63%	-141.1%
Cash From Investing Activities	-$1.721B	-$746.1M	-$183.6M
YoY Change	837.48%	-6.97%	-23.69%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$185.1M
YoY Change		32.92%
Debt Paid & Issued, Net		$302.5M
YoY Change		-15.13%
Cash From Financing Activities	1.697B	$474.8M	104.3M
YoY Change	1527.42%	126.56%	-25.34%
NET CHANGE
Cash From Operating Activities	59.86M	$302.1M	138.3M
Cash From Investing Activities	-1.721B	-$746.1M	-183.6M
Cash From Financing Activities	1.697B	$474.8M	104.3M
Net Change In Cash	36.04M	$31.38M	59.00M
YoY Change	-38.91%	-7.2%	180.95%
FREE CASH FLOW
Cash From Operating Activities	$59.86M	$302.1M	$138.3M
Capital Expenditures	-$208.9M	$767.2M	-$192.6M
Free Cash Flow	$268.8M	-$465.1M	$330.9M
YoY Change	-18.78%	133.69%	-2.85%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001692115
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2020Q4	swx	Number Of Customers Party To Contracts With Rate Components Subject To Negotiation NumberOfCustomersPartyToContractsWithRateComponentsSubjectToNegotiation	24	customer
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-37976
CY2021	dei	Entity Registrant Name EntityRegistrantName	Southwest Gas Holdings, Inc.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-3881866
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	8360 S. Durango Dr.
CY2021	dei	Entity Address Address Line2 EntityAddressAddressLine2	Post Office Box 98510
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Las Vegas,
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	NV
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	89193-8510
CY2021	dei	City Area Code CityAreaCode	(702)
CY2021	dei	Local Phone Number LocalPhoneNumber	876-7237
CY2021	dei	Security12b Title Security12bTitle	Southwest Gas Holdings, Inc. Common Stock, $1 par value
CY2021	dei	Trading Symbol TradingSymbol	SWX
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	3911021151	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	60452351	shares
CY2021	dei	Auditor Firm AuditorFirmId	238
CY2021Q4	swx	Public Utilities Property Plantand Equipment Gas Plant PublicUtilitiesPropertyPlantandEquipmentGasPlant	10789690000	USD
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CY2020	us-gaap	Profit Loss ProfitLoss	238985000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	216647000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6423000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6661000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2711000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	200779000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	232324000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	213936000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.39
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.15
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.94
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.39
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.14
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.94
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59145000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55998000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	54245000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	59259000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56076000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54312000	shares
CY2021	us-gaap	Profit Loss ProfitLoss	207202000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	238985000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	216647000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	44974000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-43730000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-54026000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	729000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	878000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	2467000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	966000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-33894000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-28751000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-17766000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	1426000	USD
CY2021	swx	Other Comprehensive Income Defined Benefit Plans Regulatory Adjustment Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansRegulatoryAdjustmentNetOfTax	67027000	USD
CY2020	swx	Other Comprehensive Income Defined Benefit Plans Regulatory Adjustment Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansRegulatoryAdjustmentNetOfTax	-5650000	USD
CY2019	swx	Other Comprehensive Income Defined Benefit Plans Regulatory Adjustment Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansRegulatoryAdjustmentNetOfTax	-28077000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-12570000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	8451000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	8643000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1652000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-2467000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-2541000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	1652000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	2541000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	20000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1713000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2038000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	14242000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4271000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4064000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	221444000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	234714000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	212583000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6423000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6661000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2711000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	215021000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	228053000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	209872000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	207202000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	238985000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	216647000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	371041000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	332027000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	303237000	USD
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-61212000	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-50717000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-54162000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	51554000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	48772000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	54245000	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	2500000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	3300000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	1900000	USD
CY2021	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	343728000	USD
CY2020	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-36239000	USD
CY2019	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	58491000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	50426000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-7694000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-1865000	USD
CY2021	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-6725000	USD
CY2020	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	15171000	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	5243000	USD
CY2021	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	89209000	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	-107427000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	-74137000	USD
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	6906000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1848000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5473000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	9294000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	7114000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	6896000	USD
CY2021	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	0	USD
CY2020	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	4724000	USD
CY2019	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	4161000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	13541000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	32591000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	21051000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-73629000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-62671000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-12764000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	111383000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	626080000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	500372000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	715626000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	825105000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	938148000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2354260000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	47638000	USD
CY2021	swx	Changes In Customer Advances Investing Activities ChangesInCustomerAdvancesInvestingActivities	15974000	USD
CY2020	swx	Changes In Customer Advances Investing Activities ChangesInCustomerAdvancesInvestingActivities	14033000	USD
CY2019	swx	Changes In Customer Advances Investing Activities ChangesInCustomerAdvancesInvestingActivities	19001000	USD
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-18256000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-9003000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-15153000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3035656000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-802069000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-951632000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	213641000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	139245000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	157946000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	138222000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	125504000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	116127000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1660696000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	662377000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	531596000	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	452664000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	356406000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	213789000	USD
CY2021	swx	Proceeds From Repayments Of Lines Of Credit And Commercial Paper ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper	-20000000	USD
CY2020	swx	Proceeds From Repayments Of Lines Of Credit And Commercial Paper ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper	0	USD
CY2019	swx	Proceeds From Repayments Of Lines Of Credit And Commercial Paper ProceedsFromRepaymentsOfLinesOfCreditAndCommercialPaper	0	USD
CY2021	swx	Proceeds From Repayments Of Short Term Portion Of Credit Facilities ProceedsFromRepaymentsOfShortTermPortionOfCreditFacilities	-48000000	USD
CY2020	swx	Proceeds From Repayments Of Short Term Portion Of Credit Facilities ProceedsFromRepaymentsOfShortTermPortionOfCreditFacilities	-104000000	USD
CY2019	swx	Proceeds From Repayments Of Short Term Portion Of Credit Facilities ProceedsFromRepaymentsOfShortTermPortionOfCreditFacilities	59000000	USD
CY2021	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	1850000000	USD
CY2020	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2019	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1264000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2736000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1858000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-729000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3402000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1488000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3063458000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	209574000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	415280000	USD
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	160000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	228000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	158000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	139345000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	33813000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-35822000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	83352000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	49539000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	85361000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	222697000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	83352000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	49539000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	104352000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	105182000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	102258000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4208000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-10951000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2752000	USD
CY2021	swx	Adjustments To Additional Paid In Capital Promissory Notes In Association With Redeemable Noncontrolling Interest AdjustmentsToAdditionalPaidInCapitalPromissoryNotesInAssociationWithRedeemableNoncontrollingInterest	-4237000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2953820000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2674953000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2505914000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2380
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2280
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2180
CY2021Q4	swx	Property Plant Equipment And Intangible Assets Gross PropertyPlantEquipmentAndIntangibleAssetsGross	1616392000	USD
CY2020Q4	swx	Property Plant Equipment And Intangible Assets Gross PropertyPlantEquipmentAndIntangibleAssetsGross	1089414000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	512343000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	422741000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	59337000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	23961000	USD
CY2021Q4	swx	Other Property And Investments OtherPropertyAndInvestments	1316479000	USD
CY2020Q4	swx	Other Property And Investments OtherPropertyAndInvestments	834245000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	17300000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10800000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	10700000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	19400000	USD
CY2021Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	59000000	USD
CY2021	swx	Deferred Purchased Gas Costs Recovered Or Refunded Period DeferredPurchasedGasCostsRecoveredOrRefundedPeriod	P1Y
CY2021Q4	swx	Accrued Purchased Gas Costs AccruedPurchasedGasCosts	52000000	USD
CY2020Q4	swx	Accrued Purchased Gas Costs AccruedPurchasedGasCosts	29000000	USD
CY2021Q4	us-gaap	Materials Supplies And Other MaterialsSuppliesAndOther	62900000	USD
CY2020Q4	us-gaap	Materials Supplies And Other MaterialsSuppliesAndOther	50000000	USD
CY2021Q4	swx	Accrued Gas Pipe Materials And Operating Supplies Including Portion From Acquisition AccruedGasPipeMaterialsAndOperatingSuppliesIncludingPortionFromAcquisition	67400000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	343023000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2161000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	345184000	USD
CY2021	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	468000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	1781332000	USD
CY2021	swx	Public Utilities Allowancefor Funds Used During Construction Capitalized Debt Portion PublicUtilitiesAllowanceforFundsUsedDuringConstructionCapitalizedDebtPortion	1046000	USD
CY2020	swx	Public Utilities Allowancefor Funds Used During Construction Capitalized Debt Portion PublicUtilitiesAllowanceforFundsUsedDuringConstructionCapitalizedDebtPortion	3202000	USD
CY2019	swx	Public Utilities Allowancefor Funds Used During Construction Capitalized Debt Portion PublicUtilitiesAllowanceforFundsUsedDuringConstructionCapitalizedDebtPortion	4558000	USD
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	0	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	4724000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	4161000	USD
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	1046000	USD
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	7926000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	8719000	USD
CY2021	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0096
CY2020	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0551
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0536
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3499000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-6789000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	10085000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	59145000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55998000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	54245000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	12000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	114000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	78000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	55000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	59259000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56076000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	54312000	shares
CY2021	swx	Number Of Performance Share Units Granted NumberOfPerformanceShareUnitsGranted	104000	shares
CY2020	swx	Number Of Performance Share Units Granted NumberOfPerformanceShareUnitsGranted	69000	shares
CY2019	swx	Number Of Performance Share Units Granted NumberOfPerformanceShareUnitsGranted	46000	shares
CY2021Q4	swx	Public Utilities Property Plantand Equipment Gas Plant PublicUtilitiesPropertyPlantandEquipmentGasPlant	10789690000	USD
CY2020Q4	swx	Public Utilities Property Plantand Equipment Gas Plant PublicUtilitiesPropertyPlantandEquipmentGasPlant	8384000000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	3397736000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	2419348000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	202068000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	211429000	USD
CY2021Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	7594022000	USD
CY2020Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	6176081000	USD
CY2019	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.027
CY2020	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.027
CY2021	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.027
CY2021	us-gaap	Lease Cost LeaseCost	122516000	USD
CY2020	us-gaap	Lease Cost LeaseCost	35528000	USD
CY2019	us-gaap	Lease Cost LeaseCost	30154000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	15413000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	278000	USD
CY2021	swx	Finance Lease Principal Payments Leases Entered Or Modified During Period FinanceLeasePrincipalPaymentsLeasesEnteredOrModifiedDuringPeriod	3547000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	12206000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	3332000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	13655000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	36000	USD
CY2020	swx	Finance Lease Principal Payments Leases Entered Or Modified During Period FinanceLeasePrincipalPaymentsLeasesEnteredOrModifiedDuringPeriod	199000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	20919000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	361000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	12444000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	33000	USD
CY2019	swx	Finance Lease Principal Payments Leases Entered Or Modified During Period FinanceLeasePrincipalPaymentsLeasesEnteredOrModifiedDuringPeriod	212000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	24687000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	13839000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1497750000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1339151000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1385294000	USD
CY2021	swx	Alternative Revenue Program Revenues Deferrals AlternativeRevenueProgramRevenuesDeferrals	13181000	USD
CY2020	swx	Alternative Revenue Program Revenues Deferrals AlternativeRevenueProgramRevenuesDeferrals	12140000	USD
CY2019	swx	Alternative Revenue Program Revenues Deferrals AlternativeRevenueProgramRevenuesDeferrals	-25112000	USD
CY2021	swx	Other Revenue OtherRevenue	10859000	USD
CY2020	swx	Other Revenue OtherRevenue	-706000	USD
CY2019	swx	Other Revenue OtherRevenue	8757000	USD
CY2021	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1521790000	USD
CY2020	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1350585000	USD
CY2019	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	1368939000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	296005000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	278316000	USD
CY2021	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	214774000	USD
CY2020	us-gaap	Contract With Customer Asset Reclassified To Receivable ContractWithCustomerAssetReclassifiedToReceivable	96996000	USD
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	11860000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	4507000	USD
CY2021	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	4500000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	296262000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Gross ContractWithCustomerAssetGross	280470000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Accumulated Allowance For Credit Loss ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss	257000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Accumulated Allowance For Credit Loss ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss	2154000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	296005000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	278316000	USD
CY2021Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	3	state
CY2021	swx	Accounts Receivable Extending Period AccountsReceivableExtendingPeriod	P1M
CY2021	us-gaap	Threshold Period Past Due For Writeoff Of Trade Accounts Receivable ThresholdPeriodPastDueForWriteoffOfTradeAccountsReceivable	P2M
CY2021Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	3	state
CY2021	swx	Gas Utility Customer Accounts Receivable GasUtilityCustomerAccountsReceivable	169114000	USD
CY2020	swx	Gas Utility Customer Accounts Receivable GasUtilityCustomerAccountsReceivable	145108000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2168000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3507000	USD
CY2019	swx	Accounts Receivable Allowance For Credit Loss Write Off Net Of Recoveries AccountsReceivableAllowanceForCreditLossWriteOffNetOfRecoveries	3580000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2095000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4693000	USD
CY2020	swx	Accounts Receivable Allowance For Credit Loss Write Off Net Of Recoveries AccountsReceivableAllowanceForCreditLossWriteOffNetOfRecoveries	2454000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	4334000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	5415000	USD
CY2021	swx	Accounts Receivable Allowance For Credit Loss Write Off Net Of Recoveries AccountsReceivableAllowanceForCreditLossWriteOffNetOfRecoveries	6490000	USD
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3259000	USD
CY2021Q4	us-gaap	Regulatory Assets RegulatoryAssets	831610000	USD
CY2020Q4	us-gaap	Regulatory Assets RegulatoryAssets	541647000	USD
CY2021Q4	swx	Net Regulatory Liabilities NetRegulatoryLiabilities	212018000	USD
CY2020Q4	swx	Net Regulatory Liabilities NetRegulatoryLiabilities	406291000	USD
CY2021	swx	Regulatory Assets Accrued Pension And Other Postretirement Benefit Costs Recovery Period RegulatoryAssetsAccruedPensionAndOtherPostretirementBenefitCostsRecoveryPeriod	P5Y
CY2021	swx	Regulatory Assets Accrued Absence Time Lag Period RegulatoryAssetsAccruedAbsenceTimeLagPeriod	P1Y
CY2021	swx	Regulatory Assets Margin Interest And Property Tax Tracking Recovery Period RegulatoryAssetsMarginInterestAndPropertyTaxTrackingRecoveryPeriod	P24M
CY2021	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	18732000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	4490000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	14242000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-6159000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1888000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4271000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-5992000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1928000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4064000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.24
CY2021Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	416000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	44994000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.24
CY2021Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	399010000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	502783000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	-1528000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	-2487000	USD
CY2021Q4	swx	Defined Benefit Plan Accumulated Other Comprehensive Income Loss Amount Recognized Regulatory Assets Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAmountRecognizedRegulatoryAssetsBeforeTax	-339356000	USD
CY2020Q4	swx	Defined Benefit Plan Accumulated Other Comprehensive Income Loss Amount Recognized Regulatory Assets Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAmountRecognizedRegulatoryAssetsBeforeTax	-427550000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-61182000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-77720000	USD
CY2021Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	4300000	shares
CY2021Q4	swx	Dividends Common Stock Paid In Kind Number Of Preferred Stock Purchase Right DividendsCommonStockPaidInKindNumberOfPreferredStockPurchaseRight	1	shares
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2021Q4	swx	Preferred Stock Purchase Right Purchase Price Per Unit PreferredStockPurchaseRightPurchasePricePerUnit	321.70
CY2021Q4	swx	Preferred Stock Purchase Price Exercisable Term Beneficial Ownership Percentage Benchmark PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmark	0.10
CY2021Q4	swx	Preferred Stock Purchase Price Exercisable Term Beneficial Ownership Percentage Benchmark With Passive Institutional Investor PreferredStockPurchasePriceExercisableTermBeneficialOwnershipPercentageBenchmarkWithPassiveInstitutionalInvestor	0.20
CY2021Q4	swx	Debt Instrument Number Of Private Placement Unsecured Senior Notes DebtInstrumentNumberOfPrivatePlacementUnsecuredSeniorNotes	2	instrument
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	297324000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	22497000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	22735000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	150526000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	197269000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	690351000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5747000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	4816000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5154000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1815000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1521000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1627000	USD
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	5200000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y8M12D
CY2021Q4	swx	Loss Contingency Maximum Exposure LossContingencyMaximumExposure	5000000	USD
CY2021Q4	swx	Loss Contingency Maximum Exposure LossContingencyMaximumExposure	5000000	USD
CY2021	swx	Deferred Compensation Plan Payment Term Option One DeferredCompensationPlanPaymentTermOptionOne	P10Y
CY2021	swx	Deferred Compensation Plan Payment Term Option Two DeferredCompensationPlanPaymentTermOptionTwo	P15Y
CY2021	swx	Deferred Compensation Plan Payment Term Option Three DeferredCompensationPlanPaymentTermOptionThree	P20Y
CY2021Q4	swx	Future Estimated Funding Amount In Next Fiscal Year FutureEstimatedFundingAmountInNextFiscalYear	59000000	USD
CY2021	swx	Defined Benefit Plan Pension Funding During Period DefinedBenefitPlanPensionFundingDuringPeriod	102000000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	59176000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-57539000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-71087000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	959000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	1155000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	1271000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-44597000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-37830000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-23376000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	-1878000	USD
CY2021	swx	Defined Benefit Plan Regulatory Adjustment Before Tax Net DefinedBenefitPlanRegulatoryAdjustmentBeforeTaxNet	88194000	USD
CY2020	swx	Defined Benefit Plan Regulatory Adjustment Before Tax Net DefinedBenefitPlanRegulatoryAdjustmentBeforeTaxNet	-7435000	USD
CY2019	swx	Defined Benefit Plan Regulatory Adjustment Before Tax Net DefinedBenefitPlanRegulatoryAdjustmentBeforeTaxNet	-36944000	USD
CY2021	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	16538000	USD
CY2020	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-11119000	USD
CY2019	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax	-11374000	USD
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	57397000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	56291000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	42465000	USD
CY2021	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	40859000	USD
CY2020	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	67410000	USD
CY2019	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	53839000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	1418211000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	1238719000	USD
CY2021	swx	Multiemployer Plan Special Surcharges MultiemployerPlanSpecialSurcharges	0	USD
CY2021	swx	Multiemployer Plan Pension Significant Number Of Plans MultiemployerPlanPensionSignificantNumberOfPlans	6	plan
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	221507000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	282489000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	261525000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	25343000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	22249000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	11145000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	246850000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	304738000	USD
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CY2021	dei	Auditor Name AuditorName	PricewaterhouseCoopers LLP
CY2021	dei	Auditor Location AuditorLocation	Las Vegas, Nevada

Files In Submission

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$SWX
Southwest Gas Holdings, Inc. Stock $swx

2021 Q4 Form 10-K Financial Statement

#000169211522000005 Filed on March 01, 2022

Income Statement

Balance Sheet

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Facts In Submission

Files In Submission

$SWX Southwest Gas Holdings, Inc. Stock $swx

2021 Q4 Form 10-K Financial Statement

#000169211522000005 Filed on March 01, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SWX
Southwest Gas Holdings, Inc. Stock $swx